Union Process has developed a system for controlling the flow of liquid nitrogen into the grinding chamber for customers performing cryogenic grinding. The engineered system includes a probe inside the grinding chamber that monitors the temperature, and at the same time, regulates the flow of liquid nitrogen into the mill to maintain the desired temperature. Raising and lowering the temperature is accomplished by adjusting the dial up or down. The device is then able to change the rate of flow of liquid nitrogen into the chamber to achieve this goal. The system was designed for use with Union Process 01-HD and 1-S Laboratory attritors, however, the system can also be adapted for use with production-sized mills.